> Assuming this DEC 3000 is the model with the memory daughter boards > populated with endless rows of (expensive and hard to find) proprietary > 100 pin SIMMs,yes I have some extra memory and daughter boards. > > Though wikipedia tells me that the 400 model only has two such daughter > boards, for a total of 8 sticks.
Yes, it does have the proprietary unobtainium ram which is why I came to cctalk. :-) It has 4 long daughter boards, each with two rows of two modules. I was lucky enough to get the manuals with the system. The manuals state that the bottom rows of slots combine to form memory bank 1 and the top rows combine to form bank two. The memory test was failing after a considerable amount of time with an ECC error so I took a gamble and removed the memory from bank 2 (8x100 pin dimms) and now the machine boots to OpenVMS and appears to be stable. This has reduced the total memory to 32MB which I'd like to at least double. I gather these systems can hold up to 512MB. > For comparison, inside my 3000 700: > http://archives.smbfc.net/uploads/retrocomputing/DEC3000_inside.jpg Yours looks exactly like what the layout of my 400 looks like except I have a framebuffer card. http://www.sysop.ca/media/DEC3000/dec3000_memory.jpg > A couple of fully populated daughter boards: > http://archives.smbfc.net/uploads/retrocomputing/DEC3000_mem.jpg > > I have to grab them from the garage, but I'm pretty sure I have a couple > fully populated daughter boards ready to go, though I don't remember the > capacty of the sticks that are in there. I do remember, that the way the > SIMMs are banked is counter-intuitive, so be sure to read the > docs as you swap memory round. > > Anyway, I'm happy to send them to you for testing. If they solve your > problem, > we can work something out. Excellent, thank you. I will mail you off-list.
